No specific info about version 5.1. Please visit the main page of Synology Drive on Mac Informer.
Note: Most recent release available only within OS X 10.11 El Capitan update.
Place where you can create, share, collaborate, and keep all of your stuff.
Online photo album solution combining an OS X manager application with a Flash-based presentation.
Provides a seamless way to create a bootable USB drive in Mac OS X.
M3 Drive Mounter provides easy-to-use way to manage network drive.